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Chapter 3 87

Basic Digital Operation

Local Settings for ARB Waveform Formats and the Dual ARB Player

Waveform Markers

The waveform markers, previously available only in the dual ARB player, are now available in

all ARB modulation formats. In addition to adding the markers to the ARB formats, you now

have four markers with each marker capable of performing RF blanking, ALC hold, and

triggering the alternate amplitude feature. Each marker can be set to perform one or all three

functions.

NOTE In the Bluetooth modulation format, markers one and two are automatically set

when payload data types are selected and the waveform is generated. See

“Bluetooth Marker Behavior” on page 88 for more information.

You can set each marker’s polarity and the marker points (first sample point or a range of

sample points). Each marker provides a rear panel output signal using the event connector

(EVENT 1, 2, 3, or 4) that corresponds to the marker number. The EVENT 3 and 4 connectors

are actually pins located on the AUX I/O connector. For more information on the AUX I/O

connector, see“Rear Panel Overview” on page 18.

The ALC hold marker function holds the ALC modulator at its current level when the marker

signal is low. When the marker signal goes high, the ALC hold function is discontinued.

ALC hold is automatically incorporated in the RF blanking marker function. So if you select

the RF blanking marker function (

Pulse/RF Blank softkey), there is no need to select the ALC

hold marker function for the same marker number. You can use the ALC hold function by

itself when you have a waveform signal that incorporates idle periods or when the increased

dynamic range encountered with RF blanking is not desired. The ALC hold should only be

used for short periods of time of less than 100 ms. Extended periods of using the ALC hold

feature may affect the waveform’s output amplitude.

The alternate amplitude marker function triggers the Alternate Amplitude feature located in

the

Amplitude hardkey menu. You still need to set up the alternate amplitude parameters. The

trigger selection for the alternate amplitude feature in the Amplitude hardkey menu should

be set to internal.When the marker signal goes low, the alternate amplitude function is

triggered. When the marker signal goes high, the trigger is terminated disengaging alternate

amplitude.

Marker settings are located in the

Marker Utilities softkey menu. The location of this softkey

and the marker softkey menus are shown in Figure 3-13. Even though the figure is for the

ARB W-CDMA modulation format, the key path is the same for all ARB formats and the dual

ARB player.

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Agilent Technologies ESG Guía de usuario Pagina 103